Automatic fire-alarm.



No. 837,941. PATENTED DEC. 11, 1906. J. H. MAROHANT.

AUTOMATIC FIRE ALARM.

' APPLIGATION FILED APR. 20, I906.

F Z I II 1' U2 \A/ITNEEEEE INVENTDFK cf. 7/VZWM State of New UNITED STATES PATENT oFFioE. JAMES H. MARCHANT, OF SCHENEQTADY, N YORK. AUTOMATIC FIRE-ALA M.

Specification of Letters Patent.

Patented Dec. 11, 1906.-

To all whom, it may concern: a

. Be it known that I, JAMES.H.'MARCHAN'1,

a citizen of the UnitedStates, residing at Schenectady, county of Schenectady, and

new and useful Improvements in Automatic F ire-Alarms, of which the following is a speci- 'fication.

The invention relates to such improvements; and it consists of the novel construc- H tion and combination of parts hereinafter described and subsequently claimed.

Figure 1 of the drawingsis a plan view of my improved automatic fireealarm circuit-' closer, showing the contacts heldapartfroni each other by means of the fusible block. Fig. 2 is a side view of the same. Fig.3 is a plan view showing the contacts in engagement with each other. Fig. 4 is a cross-section taken on the broken line 4 4m Fig.1. W The principal object of the inventionis to provide a simple and reliable device for automatically closing a fire-alarm electric circuit when subjected to-a temperature indicative of danger from fire.

Referrin to the drawin s, wherein the invention is s own in its pre erred form, l-represents a base of insulating material adapted inserted through the screw holes 2, upon which insulating-base are mounted a pair of posts 3 and 4, which project through saidbase and have their ends, which project rearwardly of the base, adapted to be connected with the wires 5 and 6 of opposite polarity of an electric fire-alarm. system, which may be of any known kind.

, The posts 3 and 4 are of conducting material, preferably metal, and .are adapted to be electrically connected together by means of a circuit-closing spring-plate 7, mounted at one end upon the post 3 and having'its other end adapted to yieldingly engage theother post 4 to close the circuit.

When there is no occasion for the circuit to be closed, it is maintained open, with the circuit-closing plate 7 held out of contact York, have invented certain to besecured to a wall or ceiling by screws the. post 4 by means ofa fuse-block 8, interposed between said circuit-closing plate 7 and a post 9, erected from said base 1, the

length of the fuse-block 8 being such that when interposed between said post 9 and circuit-closing plate 7 the latter-will be held at .a sufficient distance from the terrupt the electrical circuit.

The fuse-block 8 may be made of any easily-fusible materialadapted to therequirements of the system. affinor a mixture of for the purpose.

post 4 to in parafiin is well adapted -When the temperature 1 reaches a suflicientlyhigh degree to melt or .soften the fuse-block 8, the resilient force of the spring-plate 7 will cause it to make con 'tact with the post 4 to complete the circuit and operate the alarm apparatus. Devices of this general character are commonly at- 'tached' to vertical walls or overhead walls or ceilings, and unless the fuse-block be locked in position securely it is liable to be accidentally displaced by vibration and other causes and result in the sounding of a false alarm. To prevent such accidents, I provide the post 9 and the circuit-closing plate 7 with seats or holders for the opposite ends of the fuseblock, the seat in the post 9 being formed by a recess 10 and the seat in the p ate 7 beingformed by a recess 11 in the boss 12in the -A block made of par- I sition and cannot be jarred or shaken out of place. As shown in the drawings, the spring-plate 7 is an approximately straight piece of resilient sheet metal, one end of which is secured in a slot in the upper end of the post 3, and the fuse-block seat is formed on the plate 7 by means of a separate block, soldered or otherwise secured thereto, as shown in Fig. 4. I am thus able to secure maximum strength and durability with a niinimum amount of metal in said springp ate.

What I claim as new, and desire to secure by Letters Patent, is

A circuit-closer for electric firealarm sys-' spring-plate secured in the slot in said post;

a boss mounted upon, said spring-plate, and provided with a seat for one end of a fuseblock; a contact-post connected with the g to hold said spring-plate out of contact With other branch of the electric circuit, and lo sated in the path of said spring-plate; a resisting support provided with a seat for the other end of said fuse-block; and a fuseblock interposed between said resisting sup- 1 port and spring-plate with its opposite ends l located in said respective seats and adapted I said contact-post. 1 o

In testimony whereof I have hereunto set my hand this 14th day of April, 1. 906.

JAMES H. MARCIIANI Witnesses RUSSELL R. l-IUNT, ERNEST MARGIIANT. 

